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. 2022 Nov 15;15(22):8060.
doi: 10.3390/ma15228060.

Apparent Young's Modulus of Epoxy Adhesives

Kamil Anasiewicz  1 , Józef Kuczmaszewski  1
Affiliations

Apparent Young's Modulus of Epoxy Adhesives

Kamil Anasiewicz et al. Materials (Basel). .

Abstract

This article presents the results of a study of the properties of epoxy adhesives in an adhesive joint. The study analysed changes in Young's modulus values as a function of the rigidity of the adhesive and the type of joined material. The values of Young's modulus values were determined on the thickness of the adhesive joint using the nanoindentation method and in a tensile test of dumbbell shape sample for the adhesive material. The obtained results were analysed in terms of changes to the values of Young's modulus of the adhesive as a function of the distance from the joined material-adhesive phase boundary and compared to the adhesive material. Zones were distinguished in the layer of the adhesive joint-adjacent to the wall and the core, with different values of Young's modulus. Conclusions were drawn, indicating the relationship between the adhesive joint thickness and the increase in the value of Young's modulus. Significant differences were found in the values of Young's modulus of the adhesive joint compared to Young's modulus of the adhesive in the form of plastic.

Keywords: adhesive bonding; adhesive joint zones; apparent Young’s modulus.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Schematic diagram of the testing procedure.
Figure 2
Figure 2
Samples of the adhesive bonds prepared for nanoindentation testing (a), dumbbell-shaped samples for tensile testing (b).
Figure 3
Figure 3
The example of an adhesive bond with visible nanoindentations.
Figure 4
Figure 4
Comparison of Young’s modulus values for the Epidian 5/PAC joint bonding: A—EN-AW 2024-T3 aluminium alloy sheets; S—1.4301 stainless steel sheets.
Figure 5
Figure 5
Comparison of Young’s modulus values for the Epidian 5/Z1 joint bonding: A—aluminium alloy sheets; S—stainless steel sheets, as above.
Figure 6
Figure 6
Comparison of Young’s modulus values for the Epidian 57/PAC joint bonding: A—aluminium alloy sheets; S—stainless steel sheets, as above.
Figure 7
Figure 7
Comparison of Young’s modulus values for the Epidian 57/Z1 joint bonding: A—aluminium alloy sheets; S—stainless steel sheets, as above.
Figure 8
Figure 8
Comparison of Young’s modulus values for the Epidian 6/PAC joint bonding: A—aluminium alloy sheets; S—stainless steel sheets, as above.
Figure 9
Figure 9
Comparison of Young’s modulus values for the Epidian 6/Z1 joint bonding: A—aluminium alloy sheets; S—stainless steel sheets, as above.
Figure 10
Figure 10
Comparison of the values of the Young’s modulus of an Epidian 5/PAC, Epidian 5/Z1 adhesive joint, respectively, for a joint in the wall-adjacent zone—IF, the core—Core, and for the adhesive material.
Figure 11
Figure 11
Comparison of the values of the Young’s modulus of an Epidian 57/PAC, Epidian 57/Z1 adhesive joint, respectively, for a joint in the wall-adjacent zone—IF, the core—Core, and for the adhesive material.
Figure 12
Figure 12
Comparison of the values of the Young’s modulus of an Epidian 6/PAC, Epidian 6/Z1 adhesive joint, respectively, for a joint in the wall-adjacent zone—IF, the core—Core, and for the adhesive material.
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References

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